Popup form when entering website asking for e-mail address? [closed]

You can completely write that by Javascript, using a jQUery lightbox plugin, follow these step:

• add a “hidden” link to your page, when its “click” event is fired, that will pops your form (we’ll make the fake click event later)
• create HTML markup for the popup form
• enqueue jQuery lightbox plugin (you may choose Colorbox, Thickbox, PrettyPhoto, etc.)
• enqueue jQuery cookie plugin (for prevent the popup on every page load, we just want to show it when user first go to the page)
• enqueue your custom script

In the custom script, you should:

• make a fake click event to your “hidden” link, like this: $('#popup-link').click();
• set a cookie for your user, maybe 1 day

The Popup Dominition is a bit more complicated. It does exactly the same thing but has option to allow us to show popups after some impressions. It also has some more built-in styles for the popup form.